S7 interface - no signal values even though address is correct and connection can be made

I'm currently working on a project with a 1518TF-4 CPU which we activated on an IPC. I can establish a connection between Unity and the PLC but the signals then doesn't recieve any values and stay 0 or FALSE.

The signals I need access for are inside a DB. I've created the Signals in the S7 interface by hand and I made sure the address is correct. 
Example of a signal I created:

I also made sure, that all the settings specified here S7 TCP | realvirtual.io are done. So that there's full access and PUT/GET communication is allowed. I tried establishing a connection to signals inside a DB and Q signals. My only goal is to read signals, no need to write them. 

I've tried it with realvirtual 2022.19.6148 and 2022.15.5414. The Unity version I'm using is 2022.3.39. I also tried a simple test siemens project but that also didn't work. 

I know that it already worked at some point last year, but I can't figure out why it doesn't anymore. 

This is what my S7 config looks like: 

I've also tried all kinds of varieties of settings, so different values for max pdu length, with reverse high low bytes and more. 

I don't know if this has any relevance but I did notice that sometimes, when reverse high low bytes is activated, some Bool signals randomly jump between FALSE and TRUE, some Ints sometimes jump to 265 and back to 0 and Floats will do the same to 2.350989E-38.

Does anyone have an idea, why I cannot get the signal values in Unity? I've run out of ideas.